I need a Stargate grill speaker but yours really doesn't look like original ones...sorry but not interesting it.
So Mrossman5 some ad a printed topper like this one.

pinside.com/pinball/market/classifieds/archive/34570

Or also ad led diode in Horus and Anubis eyes like you can see in the movie.
Or ad printed little Stargate to fix onto spaghetti ramps.
Some put movie figurines (up left on 3rd picture) you can find on EBay upper the transporter gate or sarcophagus (down right on 3rd picture).

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Ad a little Stargate (made of Fimo) on the right skill shot ramp.

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Another topper...also key chains or another printed Stargate.

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The transparent topper might not be printed but probably made of two plexiglass with one cut with CNC...It's really hard to find because nobody (except pbressource) got the license or trademark to exploit Stargate copyright.
You can find some free 3d printed files by searching on the web

Look at this old post on Pinside...

https://pinside.com/pinball/forum/topic/stargate-mods